摘要
三道明水矿床位于北山成矿带的西部,是近年来新发现的一个中型Cu-Zn矿。为了解该矿床成因类型及主要控矿因素本文在前期勘探工作的基础之上,对其矿床地质特征,特别是蚀变矿化特征开展了野外及室内研究。根据热液蚀变、矿物组合及脉体间穿插关系的不同,可将三道明水矿床的蚀变和矿化划分为早、中、晚3期。其中早期矿化以黄铁矿±黄铜矿±闪锌矿、黄铁矿-闪锌矿±黄铜矿组合,以及零星浸染状黄铁矿-黄铜矿-闪锌矿组合为特征相关的热液蚀变为绿泥石±绢云母,显示出块状硫化物矿床的蚀变矿化特征;中期矿化为该矿床的主要成矿阶段,以浸染状黄铜矿-闪锌矿-黄铁矿组合为特征相关蚀变为绢英岩化,含Cu、Zn矿物(黄铜矿、闪锌矿)形成于韧性变形过程中;晚期矿化主要以石英±黄铜矿±辉钼矿脉±黄铁矿脉、方解石脉发育为特征,蚀变不明显。基于上述蚀变矿化特征的观察,并通过与区域成矿作用的综合对比,认为三道明水矿床早期可能为块状硫化物型(VMS)矿化,中期经历了韧性剪切变形驱动下的热液改造,在主剪切带富集形成了工业矿体,晚期叠加了岩浆热液有关的Cu-Mo矿化。
The Sandaomingshui deposit, located at the western part of the Beishan district, is a recently discovered medium-sized Cu-Zn deposit. Aim to understand its genesis type and controlling factors, geological characteristic of the Sandaomingshui Cu-Zn deposit is studied in this paper. According to the alteration features, mineral assemblages and crosscutting relationships, the mineralization and alteration process have be divided into the early-( stageⅠ), middle-( stage Ⅱ) and late-mineralization( stage Ⅲ) stages. The early-mineralization stage is characterized by the occurring of pyrite ±chalcopyrite ±sphalerite and pyrite-sphalerite ±chalcopyrite veins, and disseminated pyrite-chalcopyrite-sphalerite assemblage, with chlorite±sericite alteration occurred in wall rocks, which are similar to VMS-type deposits. The middle-mineralization stage, main mineralization stage, is marked by phyllic alteration and chalcopyrite-pyrite-sphalerite assemblage, in which Cu-Zn-rich minerals( chalcopyrite and sphalerite) occurred during ductile deformation. The late-mineralization stage is featured by the quartz ±chalcopyrite ±molybdenite ±pyrite and calcite veins, with unconspicuous alteration, which were hosted by open fractures. According to the alteration and mineralization features of the Sandaomingshui Cu-Zn deposit and regional mineralization characteristics, Cu-Zn mineralization of the Stage Ⅰ was likely VMS-type. The stage Ⅱ Cu-Zn mineralization overprinted on the stage I and formed the major Cu-Zn orebodies of the Sandaomingshui, which was controlled by ductile shear zones. The stageⅢ Cu-Mo mineralization superposed on the earlier Cu-Zn mineralization.
作者
高树起
王云峰
王晓东
董珍
宗飞超
狄廷川
付旭
GAO Shu-qi;WANG Yun-feng;WANG Xiao-dong;DONG Zhen;ZONG Fei-chao;DI Ting-chuan;FU Xu(Inner Mongolia Geological Prospecting Co.,Ltd.,Hohhot 010010,China;Institute of the Geology,Chinese Academy of Geological Sciences,Beijing 100029,China;Northwest Institute of Nuclear Technology,Shaanxi 710000,China)
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2021年第6期1141-1154,共14页
Acta Petrologica et Mineralogica
关键词
北山地区
三道明水Cu-Zn矿床
VMS成矿
热液改造
Beishan district
Sandaomingshui Cu-Zn deposit
VMS-mineralization
hydrothermal-modification
作者简介
高树起(1981-),男,博士在读,高级工程师,矿产勘查专业,E-mail:gaosq810706@163.com;通讯作者:王云峰(1989-),男,博士,主要从事矿床学研究,E-mail:wangyunnfeng@163.com。
